Ruthenium Red.

The Manufacturer and Builder 8, 1893

The color discovered by M. Joly in his researches on the ruthenium ammoniacal compounds rivals the most brilliant coal-tar pigments by its tinctorial intensity. The author has observed that ruthenium red is the best reagent for the pectic compounds, which are always associated with cellulose in young tissues and old tissued which have not been modified by foreign matters. It is the only reagent for the transformation products of the pectic compounds, i. e., the majority of gums and mucilages.